Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
va hanh » van hanh, va thanh, ban hanh
ty nang » ky nang, ty xang, ty hang
cai hoi » dai hoi, cai hoa, lai hoi
lai cua » dai cua, hai cua, lai chau
hieu ke » hieu kem, chieu ke, hieu ky
sach ty » sach y, sach tu, sach thu
cau tuc » cau truc, cau tu, cau luc
va danh » va dinh, va dan, dia danh
ke cau » ket cau
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang ((cai hoi) or (cau hoi)). hieu ke cau tuc ((va hanh) or (va danh)) lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang ((cai hoi) OR (cau hoi)). hieu ke cau tuc ((va hanh) OR (va danh)) lai cua te.
• Adding a wildcard symbol may retrieve word variants: so sach ty nang ((cai hoi) or (cau hoi)). hieu ke cau tuc ((va hanh) or (va danh)) lai cua te*.